hi leeboy, is it the sort of bag/ bubble plastic you get in parcels as packaging. think ive come across that on mine certainly on the inside at the base of the windscreen pillars.. the purpose of which I am unsure of, maybe to stop rattling, prevent draughts etc. no water in mine but if you have found it in the wing cavity it may have taken in some water.....cant think it could be much else.
ta andy

Just had a check, the wire goes to the side repeater, there is no bag / plastic visable, but if I put my fingers in the appature reaching towards the back of the van I can touch what feels like a plastic or foam substance.

It deforms with touch and bounces back (if you've ever felt a breast implant, it's rather like that). It gives no indication of being filled with water, more of an air-filled feel and totally dry.

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Don't grow up......................it's a trap !!!!!

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Just had a check, the wire goes to the side repeater, there is no bag / plastic visable, but if I put my fingers in the appature reaching towards the back of the van I can touch what feels like a plastic or foam substance.

It deforms with touch and bounces back (if you've ever felt a breast implant, it's rather like that). It gives no indication of being filled with water, more of an air-filled feel and totally dry.